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A ray of light, after getting reflected twice from a hemispherical mirror of radius R, emerges parallel to the incident ray. The separation of the original incident ray and the final reflected ray is 1. R 2. R √ 2 3. 2R 4. R √ 3

A ray of light, after getting reflected twice from a hemispherical mirror of radius R, emerges parallel to the incident ray. The separation of the original incident ray and the final reflected ray is      


1. R                                                                2. R 2


 


3. 2R                                                             4. R 3

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1 Answers

MOHD SULEMAN
13 Points
5 years ago
The light incident and reflected will make angle of 90° each time. The tangent from both the reflected point meet and form 90° angle the perpendicular to tangent meet at centre and at centre the perpendiculars will form an angle of 90° . So the perpendiculars are radius and the distance can be calculated by pythagoras . From this the distance between incident and reflected light which are parallel to each other is R✓2

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